Type-writing machine.



No, 684,433. P atented Oct. 3, I899. n. TURNER.

TYPE WRITING MACHINE.

(Application filed Aug. 29, 1898. Renewed Aug. 19, 1899.

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Patented Oct. 3, [899.

R. TURNER. TYPE WRITING MACHINE.

(Application filed Aug. 29, 1898. Renewed Aug. 19, 1899.)

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TYPE WRlTlNG MACHINE. (Application filed Aug. 29, 1898. Renewed Aug. 19,1899.)

Patented Oct. 3, I899.

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UNITED STATES PATENT Onnrcn.

ROBERT TURNER, OF DES MOINES, IOlVA.

TYPE-WRITING MACHINE.

SPECIFICATION forming part of Letters Patent No. 634,433, dated October3, 1899.

- Application filed August 29,1898.- Renewed August 19,1899. Serial No.727,788. (No model.)

To all whont it may concern:

Be it known that I, ROBERT TURNER, of Des Moines, in the county of Polk,in the State of Iowa, have invented new and useful Improvements inType-Writing Machines, of which the following, taken in connection withthe accompanying drawings, is a full, clear, and exact description.

My invention relates to type-writing machines, and particularly to theaction thereof, whereby the impression -blows are struck.

My object is to produce an improvedaction embodying vertically-guidedfinge r-keys,vertically-movabl'e key-levers adapted to slidelongitudinally, auxiliary bell crank levers connected to andvertically-actuated by said key-levers, type-bars suitably mounted, anddraw-bars connecting them to said auxiliaries. The auxiliaries aremounted in alternation upon suitable parallel supports below thekeylevers and one arm of each is suitably connected to a spring, uponwhich tension is pro duced or increased when a key-lever is depressed,whereby said spring aids in both returning the several parts to theirnormal positions and there maintaining them.

It is constructed as follows, reference being had to the accompanyingdrawings,in which- Figure 1 is a vertical sectional detail of atype-writing machine, showing sufficient of the working parts toillustrate this invention. Fig. 2 is a top plan, partly in section, online at so, Fig. 1, of a few of the auxiliary bell-crank levers andtheir mounting in alternation. Fig. 3 is a vertical sectional detail online y y, Fig. 1, illustrating their mounting. Fig. 4 is a verticalsectional detail of a key-lever, a bell-crank, a connection betweenthem, and a draw-bar, as upon lines ,2 in Fig. 1. Fig. 5 is a detail inside elevation, enlarged,0f a slotand-pin joint or connection betweenthe keylever and the stem of the finger-key. Fig. 6 is a verticalsection thereof. Fig. 7 is a detail in side elevation, enlarged, of aslot connection between said parts. Fig. 8 is a vertical sectionthereof.

A is a suitable frame for a type-writing machine, having a suitabletype-bar ring 2, in which suitable type-bars 3 are journaled, hereindicated as concentric to the printing-point upon the impression-platenat, and 5 is a suitable basket-rim g.

Upon the base of the frame parallel bars 6 7 are erected,each havingalongitudinal groove 8 and vertical transverse notches intersecting saidgrooves, which receive the tailpieces 9 of the bell-cranks 10, theirtrunnions 11 fitting in said grooves 8, forming a hinge or pivot bearingfor each bell-crank, said cranks being arranged in alternation, as shownin Fig. 2. Suitable draw-bars 12 connect said bell-cranks to saidtype-bars. Suitable springs 13 connect the short arms of each pair ofbell-cranks,

whereby each spring controls two type-bars to normally hold their shortarms againstsuitable stops 14 or against the basket-ring, but willpermit either type-bar to be operated. Suitable finger-keys 15 aremounted in the frame, their stems passing through guidebars 16 acrossthe frame, and the shank of each is suitably connected to a key-lever17, as by an ordinary slot-and-pin joint a,Figs. 5 and 6, or by'anordinary slot connection 1), Figs. 7 and 8. The rear end of eachkey-lever is provided with an adj usting-screw' 18, which has a bearingfrictionally against a cross-bar 19 and is free to slide more or lessthereon when the leveris operated. A link 20 connects each key-lever toa bell-crank. Cross-bars 21 operate as stops to the upward movements ofthe key-levers and can be provided with a suitable cushion to reduce thenoise of operation. It will thus be seen that the bell-cranks arespring-connected in pairs,whereby the tension of the spring is exertedboth Ways against separate cranks,so that each does double work. It willalso be evident that the bell-cranks can hook over and swing upon a rodcommon to all of them in each set, instead of using trunnions. Thekey-levers are thus respectively under equal spring tension, requiringthe equal force of stroke to depress a finger-key, its stem, itskey-lever, its bell-crank, to which it is link-connected, and thecorresponding draw-bar to impel the proper. type-bar to make animpression. The bell-cranks are arranged in two sets. The bearing commonto one set is parallel to that of the other set, The links of each setare equidistant from the bearing and equidistant from the fulcrum ofeach key-lever, and the draw-bars connected to the bell-cranks are atthe ends of the long arms of the bellcranks and equidistant from thelinks and lever-fulcrums, and the lever-fulcrums are arranged in setscorresponding to the bell-crank bearings, all of which results in anabsolute uniformity of action and evenness of force of stroke to operateeach type-bar. These are a part of the advantages or purposes of theauxiliary or bell-crank levers beneath and connected to the key-levers,the spring tension being exerted directly upon the bellcranks andthrough the links upon the key-levers, drawbars, and type-bar arms orlevers, whereby each single spring supplies tension to two key-levers.

It will be evident that each pair of the screws 18 by being adjustedwill produce the same tension upon each spring 13 and each pair ofkey-levers, and that by using some device of the nature of a dynamometerthe tension of the several pairs canbe made the same, so that the forceto operate any key will be the same as that for any other key. Eachscrew operates upon one end of each spring through the key-lever, link,and bellcrank, and in case there is any slight variation in any springeither in length or strength the screws can make the tension of all thesprings the same by regulating the distance of the rear end of eachkey-lever from the plate 19.

Having described my invention, what I claim, and desire to secure byLetters Patent, 1s-

1. In a type-writingmachine, the combination with a vertically-guidedfinger-key, of a key-lever connected thereto, having a sliding fulcralbearing at its rear end, a bell-crank mounted below and connected tosaid keylever by a link, a spring connected to one arm of said crank,and a type-bar suitably connected to the other arm of said bell-crank.

2. In a type-writing machine, the combination with a pair of key-levers,of a pair of bell-cranks arranged in alternation and links connectingtheir long arms respectively to said key-levers, of a spring connectingthe short arms of said cranks and exerting its tension upon both of saidcranks and levers, and typebars suitably connected to said bellcranks.

3. I11 a type-writing machine, the combination with the key-levers, ofauxiliary bellcrank levers connected to them, and springs coupling saidbell-cranks in pairs, whereby each spring exerts its force upon twokeylevers, and type-bars suitably connected to said bell-cranks.

4. In a type-writing machine,an action com prising key-levers, auxiliarybell-crank levers connected thereto, type-bars connected to saidbell-cranks, and springs coupling said bell cranks in pairs, wherebyeach spring does double work in returning the other members of theaction to their normal positions.

5. In a type-writing machine, an action comprising key-levers, auxiliarybell-crank levers connected thereto, type-bars connected to saidbell-cranks, and springs coupling said bell-cranks in pairs, wherebyeach spring does double work in returning the other members of theaction to their normal positions, and steps against which said type-barsare normally held by said springs.

6. In a type-writing machine, an action comprisinglongitudinally-sliding and verticallyoscillating key-levers, auxiliarybell-crank levers connected thereto, type-bars connected to saidbell-cranks, and springs coupling said bell-cranks in pairs, andexerting their forces to lift and slide each key-lever separately and toseparately return each type-bar to its nor mal position.

7. In a type-writing machine, an action com prisinglongitudinally-sliding and verticallyoscillating key-levers, auxiliarybell-crank levers connected thereto, type-bars connected to saidbell-cranks, and springs coupling said bell-cranks in pairs, andexerting their forces to lift and slide each key-leverseparately and toseparately return each type-bar to its normal position, and means toadjust the rear bearing of each key-lever and regulate the tension ofsaid springs.

S. In a type-writing machine, a main frame, parallel longitudinallygrooved and transversely-notched bars erected thereon, and bell-cranklevers having their pivotal bearing alternately in said bars, incombination with key-levers connected to said cranks, and type-bars alsoconnected thereto.

9. In atype-writing machine, a main frame, parallel longitudinally-grooved and transversely-notched bars erected thereon, bellcrank leverspivoted upon said bars, and springs connected to said bell-cranks, incombination with key-levers, and type-bars separately connected to saidbell-cranks.

10. In a type vriting machine, a main frame, parallellongitudinally-grooved and transversely-notched bars erected thereon,bell-cranks pivoted upon said bars in alternation, and springs couplingsaid bell-cranks in pairs, combined with key-levers and typebarsseparately connected to said bell-cranks.

In witness whereof I have hereunto set my hand this 12th day of August,1898.

ROBERT TURNER.

Witnesses:

WM. MILLER, GEORGIA WHITE.

